湖南株洲地区Cd、Pb污染土壤的修复实验

以海泡石、膨润土和生石灰为修复材料,对湖南株洲地区重金属元素Cd、Pb污染农田土壤进行了室内修复实验。盆栽小白菜的正交实验结果表明,对于Cd含量为1.23 mg/kg、Pb含量为136.7 mg/kg的土壤,当每10 kg土壤添加膨润土60 g、海泡石20 g、石灰6 g时,种植的小白菜中Cd含量为0.154 mg/kg,Pb含量为0.141mg/kg。与未修复土壤的实验结果对比,小白菜中Cd含量降低61%,Pb含量降低46%。

Remediation of Cd and Pb Contaminated Soil in Zhuzhou Region, Hunan Province by Using Minerals

Sepiolite,bentonite and lime were used for the remediation of Cd and Pb contaminated soil in Zhuzhou region,Hunan province,China.Orthogonal experiment method was adopted to investigate the influence of the dosage of sepiolite,bentonite and lime on the contents of Cd and Pb in the Bok-choy grown in different remediated soils.Results show that the contents of Cd and Pb are 0.154 and 0.141 mg/kg,respectively in the Bok-choy grown in the soil containing 1.23 mg/kg of Cd and 136.7 mg/kg of Pb and remediated by using 60 g of bentonite,20 g of sepiolite and 6 g of lime in every 10 kg of soil.Contents of Cd and Pb in the Bok-choy grown in the remediated soil decrease 61% and 46% compare to that in the Bok-choy grown in the original soil,respectively.